Uninterruptible power supply and method for tripping thereof
First Claim
1. An uninterruptible power supply that converts a DC voltage to an AC voltage and that supplies the AC voltage to a load device, comprising:
- a control unit configured to perform a failure determination based on an instantaneous value provided by an internal voltage and current.
3 Assignments
0 Petitions
Accused Products
Abstract
Performance failure in an uninterruptible power supply (UPS) is determined independently by itself. A selective tripping can be done within a shorter time than one cycle of an AC output. A UPS converts a DC voltage to an AC voltage and supplies the AC voltage to a load device. A UPS has a control unit conducting a failure determination by using an instantaneous value of an internal voltage and current. It is preferred that a UPS includes an inverter unit and a trip switch. The inverter unit includes a semiconductor bridge circuit generating a sinusoidal AC voltage by modulating a DC voltage with voltage instruction values, and a filter circuit inserted between the semiconductor bridge circuit and the load device. The trip switch connects and trips a connection between the inverter unit and the load device according to the failure determination of the control unit.
21 Citations
12 Claims
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1. An uninterruptible power supply that converts a DC voltage to an AC voltage and that supplies the AC voltage to a load device, comprising:
a control unit configured to perform a failure determination based on an instantaneous value provided by an internal voltage and current. - View Dependent Claims (2, 3, 4, 5)
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6. A method for tripping an interruptible power supply that converts a DC voltage to an AC voltage and that supplies the AC voltage to a load device, comprising:
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generating a signal indicating an occurrence of failure based on a deviation between an inductor current flowing through a filter inductor inserted in an inverter unit in series that modulates the DC voltage and generates the AC voltage, and an estimated value of the inductor current calculated by using a circuit constant of the inverter circuit; and opening a trip switch located between the inverter unit and the load device based on the signal. - View Dependent Claims (7)
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8. An uninterruptible power supply (UPS) comprising:
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a convertor configured to convert a DC voltage to an AC voltage; a supplier configured to receive the AC voltage from the convertor and supply the AC voltage to a load device; a detector configured to detect an instantaneous value of an internal voltage and current; and a control unit configured to determine whether the UPS'"'"'s performance is indicative of failure based on the instantaneous value and generating a failure determination signal based on its failure determination. - View Dependent Claims (9, 10, 11, 12)
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Specification